DUBUQUE, Iowa — As she waited to meet former Colorado Gov. John Hickenlooper at a recent house party in Dubuque, attorney Connie O’Connor was anxious about the liberal direction of the Democratic presidential primary. “I know a lot of people who don’t want to vote for Donald Trump but don’t necessarily want to vote for the presidential version of Alexandra Ocasio-Cortez,” she said, referring to the recently elected progressive congresswoman from New York.